<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>不小心</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            font-size: 10vw;
            font-weight: bold;
            background: #f5f5f5;
        }
    </style>
</head>
<body>
    不小心
</body>
</html>